Question

Пердвижение органических веществ по стеблю осуществляется по.....

Answer 1

............по ситовидным трубкам

Answer 2

Movement of Organic Substances in the Stem

The movement of organic substances in the stem is facilitated through a process known as translocation. This process involves the transport of organic compounds, such as sugars and amino acids, from the leaves (where they are produced through photosynthesis) to other parts of the plant, including the stem.

The translocation of organic substances in the stem occurs through the phloem tissue. The phloem is responsible for transporting these organic compounds in a process known as phloem sap movement. This movement is bidirectional, allowing for the transport of organic substances both upwards and downwards within the plant.

The movement of organic substances in the stem is driven by a combination of pressure flow and active transport mechanisms. Pressure flow involves the movement of organic compounds along a pressure gradient, while active transport utilizes energy to move substances against their concentration gradient.

In summary, the movement of organic substances in the stem is primarily facilitated by the phloem tissue through the process of translocation, utilizing pressure flow and active transport mechanisms to transport organic compounds to various parts of the plant.